I think you can make it a little easier if you mail the file to one device and then download it from your library on the other two. I do that all the time. Syncing works fine. It's probably not a lot easier than mailing it to 3 devices but it should be a little easier.
If you get the books to the device via Calibre I doubt if syncing will work. I just use Calibre for conversions, not to store or transfer books, so I'm not sure, but I'd be surprised if it did.
I have a Voyage and a Paperwhite and I read on my phone when I don't have one of those with me. Syncing works fine for me but more and more I'm finding I don't care about it. On the phone I prefer to read with Moon+ even though I have the Kindle app and my current book is always in it. With Moon+ I have to find my place and I've gotten so used to doing that that it's not really an issue. I make it a point to remember the chapter number and finding my place within a chapter is simple.
Barry
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